Examples of “alga” in a Sentence

noun A simple aquatic organism that makes its own food by photosynthesis, ranging from a single cell to huge seaweeds such as giant kelp.

• The pond had turned green because an alga was multiplying in the warm water.
• Kelp is a large alga that grows in dense forests off some coasts.
• Under the microscope, each alga looked like a tiny green bead.